Door-check.



H.IK. PAIRALL.

DOOR CHEUK. APPLIOATION HLBD Nov. an, 1909.

Patented 1131.21, 1911;

UNITED STATES PATENT OFFICE.

HARRY K. FAIRALL, F HIGHLANDS, CALIFORNIA.

'DOOR-CHECK.

Specification of Letters Patent. Patented Mar. 21, 1911.

Application led November 22, 1909. ySerial No. 529,364'.

To all whom it may concern:

Be it known that I, HARRY K. FAIRALL, a citizen of the United States, residing at I-Iighlands, in the county of San Bernardino and State of California, have invented new and useful Improvements in Door-Checks, of which the following is a specification.

This invention relates to door checks such as are used for preventing the sudden closing or slamming of a door.

The device is especially useful in connection with a door which is closed by a spring or similar means.

The object of the invention is to produce a device of this class which is simple in construction and which will operate positively to check the closing movement of a door for the purpose suggested.

In its general construction the device comprises a member attached to the door frame and a bracket carried by the door. Vhen the door is in its open position these parts become disconnected, but when the door is closed they come into operative relation with each other.

The invention consists in the construction and combination of parts, to be more fully described hereinafter, and particularly set forth in the claims.

In the drawing annexed hereto, which fully illustrates my invention, Figure .1 is a front elevation showing a portion of a door and door frame tol which the invention is applied. Fig. 2 is ahorizontal section taken through the doorcheck, through the edge of the door and through the door j amb. This view shows the door in its closed position. Fig. 8 is a view similar to Fig. 2 but showing the door in the act of being opened, and at a point where it releases itself from the member carried by the jamb.

Referring more particularly to the parts, 1 represents the jamb of the doorway in which the door 2 is mounted to swing. This door is supposed to be mounted upon hinges attached at the left edge of the door.

In applying my invention, I provide a deep chamber 3 in the door jamb, which opens out upon the reveal of the door frame. Within this chamber 3 I provide a check cylinder 4. The inner end of this cylinder is formed with a head 5, and through this head a vent 6 is formed. As shown, the cylinder is of smaller diameter than the chamber 3 so that an air space 7 is formed around the cylinder. The vent 6 opens communication between the interior of the cylinder and this air space. The forward end of the cylinder is threaded and attached by this means to a face plate 8 which is recessed in the reveal of the door frame as indicated. This plate may be secured in position by screws or similar fastening devices 8a.

The plate 8 forms the outer head for the cylinder and is formed with an opening 9 through which slides a plunger rod or piston rod 10. To the inner end of this rod 10, a head 11 is attached, said head being provided with a cup washer 12 which makes the head fit substantially air tight in the cylinder.

Around the rod 10, and between the plunger head 11 and a fixed head or plate 8, a coiled `spring 13 is placed. It should be understood that this spring is not attached either to the head 11 or the head 8, and when the door check is in its closed position the spring may occupy a position such as that indicated in Fig. 2. In this connection, attention is called to the fact that this spring is much shorter than the distance between the heads 11 and 8, when the head 11 is in its innermost position, that is, when the door check is in its completely closed position.

The plunger rod or stem 10 is provided on its outer end with a retractor head 14, which is of substantially conical form, presenting an abrupt shoulder 15 on the side adjacent to the door jamb. To the free edge of the door 2 and adjacent to the plate 8, I attach a bracket 16, the outer portion of which is offset so as to present an arm 17 which projects horizontally across the face of the reveal adjacent to the plate 8. On its inner face and near its extremity, the arm 17 is provided with a recess 18 which is adapted to engage the point of the conical head 14, and on the inner side of the arm 17 there is secured a retractor 19 which is in the form of a leaf spring. The butt end of this spring is attached by screw 20 to the end of the arm 17 adjacent to the door, and the other end of the spring is offset inwardly toward the plate 8. The arrangement is such that the end of this spring is adapted to engage under or behind the shoulder 15.

The mode of operation of the door checkwill now be described.

' As .the door 2 isswungshut, the arm 17 j will strike the conical head 14 ofthe plunger arm or stem 10, the pointofv the head 'being .received adjacent to therecess 18. As

the door closes, the head seatsinv the recess,

and thea-rm 17 pushes the plunger inwardly. During rthis movement the head 11 compresses/the air in the cylinder and this checks the advance of the door. The air Vwhich is compressed in the cylinderV linds an exitatj the opening 6, ,so thaty itk does not f 'the-Cylinder arrest the closing movement ofthe door, but

vFig. 2. Vhen the arm 17 `comes .into contact` with the head 14, the retractor Ylaengages the conical face .ofthe headjldand is Vdisplacedrlaterally as` itrpasses toward shoulder and springs in the rear side of the head. Itsoon'passes the behind the-shoul When thedoor withdraws the deras indicated in Fig. 2. is opened,^this retractor 19 plunger to a point such as thatindicated in Fig. 3. The movementof the plunger un- I j derk the'action ofthe retractor isl suiiici'ent toVr compress the Vspring 13 as shown in-,this ignreso thatas the swinging movement of the door progresses, the retractor` 19V will. re-

- lease itself in a resilient manner .from the head y 14.. After the plunger becomes released from the retractor the spring 13A returns. it

' to anintermediate position in the cylinder.

Vlie in Vthe claim as In this intermediate position the head 14e willlie directlyin the path ofthe arm 17 so Vthat when the door closes it will engagethe head of the plunger .y as suggested .-ahove.V VIn this way it will be seen that thev spring 13 has a double-function; it facilitates the disengagement of the retractor from the plun ger head 14 by permit-ting an outward move'- ment of the plunger, and it' returns the plunger toa partially closed vposition so that the head of the plunger will certainly path of thea-rm as the door closes. s .Having described my invention, whatV I new and desire to secure by Letters Patent is: 1. A door check comprising in vcombination, a plunger, mounted to slide inwardly with respect to theldoor frame and support Y ed'by `the door frame, means including a checking device for resisting thefinward movement of said plunger, a member constructed to be attached to the door adapted to yengage said plunger to force the sameinwardly, and a resilient retractor carriedby said memberandcoperating therewith to withdraw said plunger whenv the door is opened.

Vspring affording means ing sald rto disengage itself therefrom.

' said plunger inwar ly,

d espeso 'tac'hed'to the door framea plunger including ay piston andy piston rod extending from said cylinder,

a bracket constructed to be "seated in a door and adapted to engage the endof said rod as the door closes, means for partially withdrawing said rod `when the door` is moved toits "open position, and a for partially returnplunger toward its innermost position. .v 'f j j 3. A door check comprising, in combination a checking cylinder adapted to be seated in a Ydoor frame,

Vmounted to slide in said cylinder and havinflr a rod projecting from. said `cylinder, sai

rod having a retractor head on the outer end thereof, a bracket adapted to be attached to thevdoor having an arm adaptedfto engage said retractor head to force' the same inwardly, a retractor carried by said arm and adapted to engage said retractor head so as to withdraw the same when the door is moved to its open position, said v retractor lbeiner arranged to swing out of reach of said head t. A door check comprising, in combination, a check device adapted' to be seatediin a door frame and having a projecting plunger rod, said .d rod having a retractor head thereupon presenting a shoulder ony the side thereotkadjacent to said checkvdevice, a bracket adapted to be attached tothe door to engage said head to force said plunger .inwardly and a resilient retractor securedl to saidbracket'and adapted-to snapv over said head and `engaging said shoulder to withdraw said plunger rod` when the door is opened. d' f, 'f

` 5. A door checkcomprisin in combination a check device adapted tone mounted in a door frame and having a projecting plunger rod, said rod having ayretractor head thereupon presentinga shoulder on the side thereof adjacent to saidv check device, a bracket adapted to be attached tothe door, and adapted to engagesaid head `to force afresilient retractor supported 'by the door ada ted to snap over said head to engage `said sioulder' to withdraw said plunger yrod when the'door'is opened, and a spring for partiallyreturning said plunger when released by said retractor.

6. A door 'check comprising in combination a check cylinder adapted to be seated in a door frame, a plunger having a head mounted to slide in said cylinderand havin a rod adapted to project beyond the.- door frame, saidrodV having a-retractor head` of substantially conical form on the outer end thereof, an arm `adapted to be attached to the edge of the door to engage said conical head to force said plunger inwardly, a jre a plunger having a head silent retraetor supported by the door and In Witness that I claim the foregoing I cooperating With said head so as to snap into have hereunto subscribed my name this 15th 10 engagement therewith and to aiord means day of November, 1909.

for withdrawing said plunger When the door HARRY K FAIRALL 5 moves to its open position, and a spring disposed around said rod and adapted to re- Witnesses:

turn the plunger to an intermediate posi- F. D. AMMEN,

tion when released by said retraetor. EDMUND A. STRAUSE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

